英语语法分析

The excretion of methyl mercury becomes very difficult because of high enterohepatic circulation and reabsorption by proximal convoluted tubule.

由于甲基汞在体内的肠肝循环和肾脏近曲小管对甲基汞的重吸收效率高，使甲基汞的体外排泄十分困难。

Chronic exposure to Cd mainly causes the renal proximal tubule damage, which represents that the excretion of proteinuria, glucosuria and aminoaciduria.

慢性接触镉主要引起肾小管损伤，表现为蛋白尿、糖尿和氨基酸尿。

Objective: To evaluate the tubule occluding ability of tricalcium silicate.

目的：评价硅酸三钙对牙本质小管的阻塞能力。